hatchet vs singlestick

hatchet

noun
  • A small, light axe with a short handle; a tomahawk. 

verb
  • To cut with a hatchet. 

singlestick

noun
  • A one-handed wooden stick used for fencing in place of a sword. 

  • A martial art, sport or exercise using a cudgel or backsword. 

How often have the words hatchet and singlestick occurred in a corpus of books? (source: Google Ngram Viewer )